Develop Reference

fixed side scrollbar for case study

This is my first post. I am new to code and am trying to code my case studies for my portfolio. I want to include a "scroll bar" to work as a sort of timeline on the left side that is "fixed" so as you scroll down the page it fills up. This website has a something close to what I am looking to accomplish. they have a small red "scroll bar" on the left side.
https://edesigninteractive.com/

A simple way is to divide your scroll position by the height of the body object.
The height of the body object can be obtained with var numerator = document.body.scrollTop.
Your scroll position is slightly more tricky. You will want the height of the element minus the might of the view port. This can be done with
var denominator = document.documentElement.scrollHeight - document.documentElement.clientHeight
from there you you set up an event listener that sets the height of your scrollbar element as a percentage of the viewheight when scrolling.
document.addEventListener('scroll', function(e) {
document.getElementById('scrollBar').style.height = numerator/denominator + '%'
});
There might be better ways to do this, but this is the first one to come to my mind.

I modified alleynraven answer, and put it into codepen.
var $scrollEl = document.querySelector('.scroll-progress')
document.addEventListener('scroll', function(e) {
var currentPos = document.documentElement.scrollTop;
var scrollPos = document.documentElement.scrollHeight - document.documentElement.clientHeight;
$scrollEl.style.height = (currentPos / scrollPos * 100) + '%';
});
.scroll-progress {
position: fixed;
left: 0;
top: 0;
width: 8px;
background-color: rgb(248 113 113);
}
.bg-blue {
background-color: rgb(186 230 253);
}
.bg-teal {
background-color: rgb(153 246 228);
}
.bg-lime {
background-color: rgb(217 249 157);
}
.bg-yellow {
background-color: rgb(254 240 138);
}
<div class="scroll-progress"></div>
<div class="content">
<div class="bg-blue" style="height: 1000px;"></div>
<div class="bg-teal" style="height: 1000px;"></div>
<div class="bg-lime" style="height: 1000px;"></div>
<div class="bg-yellow" style="height: 1000px;"></div>
</div>

How to make my animated skills bar responsive

I have an animated skills bar on my website, which fires when the section scrolls into view. Everything is working well so far.
Except when the viewport changes/window resizes the animated bars won't adjust to it and will be too long or to short.
I tried to solve this problem with
$(window).resize(function(){location.reload();
but on mobile viewport it keeps refreshing the page even though I'm just scrolling.
I already searched the net to see if there is a way to just reload the specific jquery function, but couldn't find anything. Or to be honest I didn't quite understood I guess, and couldn't get it working.
Here is what I found: https://css-tricks.com/forums/topic/reload-jquery-functions-on-ipad-orientation-change/
I read there is a way to make the website reload the whole js file. But since I still have other animations on my page, I don't know if this is the best way to do it.
I'm glad if anyone could help me with this. I'm very new to coding and my js/jquery knowledge is still very limited/non-existent.
here is my script for the bar animation
var $meters = $(".meter > span");
var $section = $('#skills .meter');
var $queue = $({});
function loadDaBars() {
$meters.each(function() {
var $el = $(this);
var origWidth = $el.width();
$el.width(0);
$queue.queue(function(next) {
$el.animate({width: origWidth}, 800, next);
});
});
}
$(document).bind('scroll', function(ev) {
var scrollOffset = $(document).scrollTop();
var containerOffset = $section.offset().top - window.innerHeight;
if (scrollOffset > containerOffset) {
loadDaBars();
$(document).unbind('scroll');
}
});
the width for the skillbar is defined via div class and span in %.
Maybe there is a css solution to this?
edit: this is how my html and css code looks like
.meter {
background-color: hsla(54, 73%, 95%, 1);
vertical-align: bottom;
width: 100%;
position: relative;
}
.meter>span {
display: block;
background-color: rgb(241, 233, 166);
position: relative;
overflow: hidden;
}
<div class="col-lg-6 col-md-6 col-sm-6">
<div class="meter">
<span style="width: 50%"></span>
</div>

You remove the style property of the bar once the animation has finished. This way the css rule will apply again:
$el.animate({width: origWidth}, {duration: 800, complete: function (){$el.removeAttr('style')}}, next);
(Assuming the width defined by the css is responsive)

Run Jquery only when an element is in the viewport

I'm trying to perform the Jquery function below when the element becomes visible in the viewport rather than on the page load. What would I need to change to allow that to happen? I'm using an external JS file to perform the Jquery, so keep that in mind.
Here's a piece of the HTML that is associated with the Jquery function -
<div class="skillbar clearfix " data-percent="70%">
<div class="skillbar-title" style="background: #FF704D;">
<span>Illustrator</span></div>
<div class="skillbar-bar" style="background: #FF704D;"></div>
<div class="skill-bar-percent">70%</div>
</div>
jQuery(document).ready(function(){
jQuery('.skillbar').each(function(){
jQuery(this).find('.skillbar-bar').animate({
width:jQuery(this).attr('data-percent')
},4000);
});
});

I once came across such problem and what I used is waypoints small library.
all you need is to include this library and do:
var waypoint = new Waypoint({
element: document.getElementById('waypoint'),
handler: function(direction) {
console.log('Element is in viewport');
}
})

Using CSS3 transitions instead of jQuery animations might be more performant and simpler. a cheap and nasty way of pushing it out of screen to demonstarate the effect.
There's a couple of things you'll need to do - firstly if you only want the animation to trigger when it's in the viewport then you'll need to check if anything is in the viewport on scroll. Then only update the bars width when it comes into view. If you want the effect to repeat every time it comes into viewport you'll need to set .skillbar-bar's width back to 0 if it's out of the viewport (just add an else statement to the viewport checking if)
I've added a 1000px margin-top and 400px margin-bottom in my example to .skillbar as a cheap and nasty way of demonstrating the effect
(function($){
$(document).ready(function(){
var $els = $('.skillbar'); // Note this must be moved to within event handler if dynamically adding elements - I've placed it for performance reasons
var $window = $(window);
$window.on('scroll', function(){
$els.each(function(){ // Iterate over all skillbars
var $this = $(this);
if($window.scrollTop() > $this.offset().top - $window.height()){ // Check if it's in viewport
$this.find('.skillbar-bar').css({'width' : $this.attr('data-percent')}); // Update the view with percentage
}
});
});
});
}(jQuery));
.skillbar{
margin-top: 1000px;
margin-bottom: 400px;
position: relative
}
.skillbar-bar{
transition: width 4s;
position: absolute;
height: 20px;
}
.skill-bar-percent{
position: absolute;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
Scroll down 1000px :)
<div class="skillbar clearfix " data-percent="70%">
<div class="skillbar-title">
<span>Illustrator</span></div>
<div class="skillbar-bar" style="background: #FF704D; width: 20%"></div>
<div class="skill-bar-percent">70%</div>
</div>

This might work for you.
var el = $('.yourElement'),
offset = el.offset(),
scrollTop = $(window).scrollTop();
//Check for scroll position
if ((scrollTop > offset.top)) {
// Code..
}

Finding where element meets top of scrollable div

I have a scrollable div container fits multiple "pages" (or div's) inside of it's container.
My goal is to, at any given moment, figure out where inside my red container does it reach the top of my scrollable container. So it can be a constant on scroll event, or a button that triggers this task.
So for example. If I have a absolute div element inside one of my red boxes at top:50px. And if I scroll to where that div element reaches the top of my scrollable container. The trigger should say that I am at 50px of my red container.
I'm having a hard time grasping how to accomplish this but I've tried things like:
$("#pageContent").scroll(function(e) {
console.log($(this).scrollTop());
});
But it doesn't take into account the separate pages and I don't believe it it completely accurate depending on the scale. Any guidance or help would be greatly appreciated.
Here is my code and a jsfiddle to better support my question.
Note: If necessary, I use scrollspy in my project so I could target which red container needs to be checked.
HTML
<div id="pageContent" class="slide" style="background-color: rgb(241, 242, 247); height: 465px;">
<div id="formBox" style="height: 9248.627450980393px;">
<div class="trimSpace" style="width: 1408px; height: 9248.627450980393px;">
<div id="formScale" style="width: 816px; -webkit-transform: scale(1.7254901960784315); display: block;">
<form action="#" id="XaoQjmc0L51z_form" autocomplete="off">
<div class="formContainer" style="width:816px;height:1056px" id="xzOwqphM4GGR_1">
<div class="formContent">
<div class="formBackground">
<div style="position:absolute;top:50px;left:100px;width:450px;height:25px;background-color:#fff;color:#000;">When this reaches the top, the "trigger" should say 50px"</div>
</div>
</div>
</div>
<div class="formContainer" style="width:816px;height:1056px" id="xzOwqphM4GGR_2">
<div class="formContent">
<div class="formBackground"><div style="position:absolute;top:50px;left:100px;width:450px;height:25px;background-color:#fff;color:#000;">This should still say 50px</div></div>
</div>
</div>
</form>
</div>
</div>
</div>
</div>
CSS
#pageContent {
position:relative;
padding-bottom:20px;
background-color:#fff;
z-index:2;
overflow:auto;
-webkit-overflow-scrolling: touch;
-webkit-transform: translate(0, 0);
-moz-transform: translate(0, 0);
-ms-transform: translate(0, 0);
transform: translate(0, 0);
}
#formBox {
display: block;
position: relative;
height: 100%;
padding: 15px;
}
.trimSpace {
display: block;
position: relative;
margin: 0 auto;
padding: 0;
height: 100%;
overflow: hidden;
}
#formScale::after {
display: block;
content:'';
padding-bottom:5px;
}
#formScale {
position:relative;
width:816px;
margin:0;
-webkit-transform-origin: 0 0;
-moz-transform-origin: 0 0;
transform-origin: 0 0;
-ms-transform-origin: 0 0;
}
.formContainer {
position:relative;
margin : 0 auto 15px auto;
padding:0;
}
.formContent {
position:absolute;
width:100%;
height:100%;
}
.formBackground {
width:100%;
height:100%;
background-color:red;
}
JS
var PAGEWIDTH = 816;
$(window).resize(function (e) {
zoomProject();
resize();
});
function resize() {
$("#pageContent").css('height', window.innerHeight - 45 + 'px');
}
function zoomProject() {
var maxWidth = $("#formBox").width(),
percent = maxWidth / PAGEWIDTH;
$("#formScale").css({
'transform': 'scale(' + percent + ')',
'-moz-transform': 'scale(' + percent + ')',
'-webkit-transform': 'scale(' + percent + ')',
'-ms-transform': 'scale(' + percent + ')'
});
$(".trimSpace").css('width', (PAGEWIDTH * percent) + 'px');
$("#formBox, .trimSpace").css('height', ($("#formScale").height() * percent) + 'px');
}
zoomProject();
resize();
EDIT:
I don't think I am conveying a good job at relaying what I want to accomplish.
At the moment there are two .formContainer's. When I scroll #pageContainer, the .formContainer divs move up through #pageContainer.
So what I want to accomplish is, when a user clicks the "ME" button or #click (as shown in the fiddle below), I'd like to know where in that particular .formContainer, is it touching the top of #pageContainer.
I do use scroll spy in my real world application so I know which .formContainer is closest to the top. So if you just want to target one .formContainer, that is fine.
I used these white div elements as an example. If I am scrolling #pageContainer, and that white div element is at the top of screen as I am scrolling and I click on "ME", the on click trigger should alert to me that .formContainer is touching the top of #pageContainer at 50px from the top. If, the the red container is just touching the top of #pageContainer, it should say it is 0px from the top.
I hope that helps clear up some misconception.
Here is an updated jsfiddle that shows the kind of action that I want to happen.

I am giving this a stab because I find these things interesting. It might just be a starting point since I have a headache today and am not thinking straight. I'd be willing to bet it can be cleaned up and simplified some.
I also might be over-complicating the approach I took, getting the first visible form, and the positioning. I didn't use the getBoundingClientRect function either.
Instead, I approached it trying to account for padding and margin, using a loop through parent objects up to the pageContent to get the offset relative to that element. Because the form is nested a couple levels deep inside the pageContent element you can't use position(). You also can't use offset() since that changes with scroll. The loop approach allowed me to factor the top margin/padding in. I haven't looked at the other solutions proposed fully so there might be a shorter way to accomplish this.
Keeping in mind that the scale will affect the ACTUAL location of the child elements, you have to divide by your scale percentage when getting the actual location. To do that I moved the scalePercentage to a global var so it was usable by the zoom function and the click.
Here's the core of what I did. The actual fiddle has more logging and junk:
var visForm = getVisibleForm();
var formTop = visForm.position().top;
var parents = visForm.parentsUntil('#pageContent');
var truOffset = 0;
parents.each(function() {
truOffset -= $(this).position().top;
});
// actual location of form relative to pageContent visible pane
var formLoc = truOffset - formTop;
var scaledLoc = formLoc / scalePercent;
Updated Fiddle (forgot to account for scale in get func): http://jsfiddle.net/e6vpq9c8/5/

If I understand your question correctly, what you want is to catch when certain descendant elements reach the top of the outer container, and then determine the position of the visible "page" (div with class formContainer) relative to the top.
If so, the first task is to mark the specific elements that could trigger this:
<div class='triggerElement' style="position:absolute;top:50px;left:100px;width:450px;height:25px;background-color:#fff;color:#000;">When this reaches the top, the "trigger" should say 50px"</div>
Then the code:
// arbitrary horizontal offset - customize for where your trigger elements are placed horizontally
var X_OFFSET = 100;
// determine once, at page load, where outer container is on the page
var outerContainerRect;
$(document).ready(function() {
outerContainerRect = $("#pageContent").get(0).getBoundingClientRect();
});
// when outer container is scrolled
$("#pageContent").scroll(function(e) {
// determine which element is at the top
var topElement = $(document.elementFromPoint(outerContainerRect.left+X_OFFSET, outerContainerRect.top));
/*
// if a trigger element
if (topElement.hasClass("triggerElement")) {
// get trigger element's position relative to page
console.log(topElement.position().top);
}
*/
var page = topElement.closest(".formContainer");
if (page.length > 0) {
console.log(-page.get(0).getBoundingClientRect().top);
}
});
EDIT: Changed code to check formContainer elements rather than descendant elements, as per your comment.
http://jsfiddle.net/j6ybgf58/23/
EDIT #2: A simpler approach, given that you know which formContainer to target:
$("#pageContent").scroll(function(e) {
console.log($(this).scrollTop() - $("#xzOwqphM4GGR_1").position().top);
});
http://jsfiddle.net/rL4Ly3yy/5/
However, it still gives different results based on the size of the window. This seems unavoidable - the zoomProject and resize functions are explicitly resizing the content, so you would have to apply the inverse transforms to the number you get from this code if you want it in the original coordinate system.

I do not fully understand what it is that you are needing, but if i am correct this should do the trick
$("#pageContent").scroll(function(e) {
// If more then 50 pixels from the top has been scrolled
// * if you want it to only happen at 50px, just execute this once by removing the scroll listener on pageContent
if((this.scrollHeight - this.scrollTop) < (this.scrollHeight - 50)) {
alert('it is');
}
});
ScrollHeight is the full height of the object including scrollable pixels.
ScrollTop is the amount of pixels scrolled from the top.

You can use waypoints to detect the position of divs based on where you're scrolling.
Here is a link to their official website's example: http://imakewebthings.com/waypoints/shortcuts/inview/

CSS: dynamic width div

I'm coding a slider and I have problems with the stylying of the container.
I have 3 div:
A div that sets the width and height of the slider
A container div with all the content divs (and the scroll for the slider)
Many divthat show different contents each
What I want to do is apply a negative margin on the second div to slide the content.
LIVE example: http://jsbin.com/efuyix/7/edit
JS:
function animate(element) {
var start = new Date();
var id = setInterval(function() {
var timePassed = new Date() - start;
var progress = timePassed / 600;
if (progress > 1) progress = 1;
element.style.marginLeft = -50 * Math.pow(progress, 5)+"px";
if (progress == 1) {
clearInterval(id);
}
}, 10);
}
CSS
.example_path {
overflow: hidden;
width: 50px;
height: 50px;
}
.example_block {
min-width: 100px;
height: 50px;
float:left;
}
.example_in_block {
width: 50px;
height: 50px;
float:left;
}
HTML
<div class="example_path">
<div class="example_block" onclick="animate(this)">
<div class="example_in_block" style="background-color:blue;"></div>
<div class="example_in_block" style="background-color:pink;"></div>
<div style="clear:both;"></div>
</div>
</div>
The problem:
The width of .example_block has to be exactly the same or more than (amount of content divs .example_block * 50 [width size of content div] ) to work.
For example, if I set the width size of the .example_block to 90, the pink div will be below the blue div and not beside it.
I want the container div to be dynamic so I don't have to set the specific width size.
How can I do this?

Simply remove the float:left in the .example_block.
See http://jsbin.com/efuyix/9/edit

Not with negative margins. You can probably set padding on one of the outer DIVs.
Also, min-width isn't going to be backwards compatible with older versions of IE.
Check this example: http://jsfiddle.net/5xBYN/6/
If the initial positioning is good, you can then use negative values on your container DIV (the third DIV) for top, left, right or bottom to achieve sliding.
Update:
Maybe this is closer to what you want. http://jsfiddle.net/5xBYN/7/
I'm still not sure what you are trying to do. Maybe edit the fiddle I posted and update your question with what I'm getting wrong if there is anything.